I'm considering doing this setup, but with just the mufflers and 3" custom pipes. Either that or a roush axle back with 3" resonator delete. After seeing this... decision decisions! Looking forward to updated photos and possibly a video!
91
I've been using Shell V-power with the occasional chevron 91, my car is close to 6k miles and I haven't had an issue with it. If I could I would use 93, but california lol. Like some mentioned before, it shouldn't be your gas at all unless using crappy gas. Good luck!!!